Vibration damper



April 29, 1952" J. A. HARDY VIBRATION DAMPER Filed March 18, 1949 2 SHEETS-SHEET l m El@ )luk Y NT t\ 2 SHEETS-SHEET 2 J. A. HARDY VIBRATION DAMPER April 29, 1952 Filed March 18, 1949 5%@ mm. A W mm N Y Z J u W Uli' EEE %\N\ m N `NN NNN v 5N SNN M, mwN

Patented Apr. 29, 1952 VIBR'ATION DAMPER James-A: Hardy; Indianapolis, Ind., assignor to Schwitzen-Cummins- Company,

l-ndnawcorporatlonf.

Indianapolis,

Application March' 18, 1949, SferialNo; 82,241 4Glai`mS... (Cl. i4-574) This. invention relates to avibration damper; particularly' applicable'forn use in damping-1 the vibrationof" engine' crank shafts Ywherein an inertia* element] is mountedv in` driving relation therewith through a suitable' energy,` converting medium, such asa' rubberinsertv for*k absorbing andV lr educing'torsional impulses; f

`Itis the object of "the invention to lincorporate means' for" air'coolingsuch" energy" converting medium, particularly when'it"l consists of'- rubber or' a rubb'erlike material; toA thereby vprevent its disintegration through the eiectVV of heaty generated therein. Incertaininstallations and"l uses of Isucha` damper-, k a highdegree of heat is generatedin the' rubber by rea-son of' its internal shearing actiondue; toVV rapid' pulsation, and'par'- ticularly wherein'it'mayi'be `housedand associated with heat' generating` engines such. as inter-nal combustionl engines.`

It is, therefore, proposed to provide anJ air cooling' means for withdrawing and' dissipating heat' fromy the rubberl upon the 'damper being rotated` at high'- speeds; This yis-v accomplished; by incorporating yfins or" suitable` formationsinf the damper for generating airA currents thereoverand thereby withdraw heat by convection from: the rubber Ythrou'glfi the` air. cooled-:metal elements in contact therewith'.

' The' full-nature offthe invention willbellunderstood from the accompanying 4`drawings and l the followingwdescription' and claims:

Fig.` 1` isf'a'lcentral vertical sectionthrough Aone form ofvibrationdamper.

Fig. 2f'is asectional perspective View showing aportion thereofl with partsy broken away.

Fig; 3"'isracentral vertical'Ik section-'through a modied" form `offdamper including al beltdriven pulley;

Fig'. 4-`is ai fragmentary fsection through a second modified form of damper.

Fig; 5isA atfra'g-mentary section through a third modied form of damper.

In the drawings Fig:` 1 is illustrative of one modification cfa vibration damperhaving av driving sleeve IIJ adapted to be suitably secured: to and drivenby; ag.shaftsuch as the crank shaft of aninternal combustion engine. Said sleeve isproyidedA with a angell towhich is'Y secured by rivets` I 2 or the' like, a dished driving' platefl 3. Adjacent', the outer peripheryoflsaid plate there is, provided; an outer annular series of spacedair discharge yports I5'. Saidldisk is formedj adjacent the discharge ports' I with acylindricalilange I 6. Secured' about the outer periphery of said flange I6 there is provided an energy converting medium Ilherein shown in the form of a band of rubber orv rubber=like material with sufficient thickness to permit of an internal shearing action. Mounted about the band I1 there is an outer inertia` element I8.

Mounted about the inner periphery of the flange I6 there is a similar band of rubber I9, and mounted internally of said band I9 thereis' provided an internal inertia member 20. The inertia` member and bands are mounted withrre'- spect to eachother to prevent angular displacement therebetween such asV through clamping engagement or surface bonding therebetween'.

The'relative dimensions of the bands and' in# ertia elements and the relative weights of the latter are `such as to obtain therethrough the desired dampening action depending upon the speed of rotation and type of mechanism with which the member is associated. However, vvherein'-V the structure isY such that the inertia member and its associated energy converting medium is large@` ly shielded from normal air cooling, diiculty results from overheating and consequent disintegration of the rubber or rubber-like material.. It, therefore, becomes necessary to artificially cool this, material. To that end the inner shielded inertiaY element-2t is formed with a series. of fins 2| about one end thereof to extend toward and lie adjacent the air outlet ports I5. Said ns serve in thenature of fan blades or vanes, as in a rotary blower Wheel, so that through the rapid rotation of the damper, air will be drawn over the inertia member`2IJ and discharged through the outlet ports I5.

By means of such structure a ow of air will ber induced over and about the exposed surfaces of thev inner shielded inertia member 20 to dis-l sip'ate heat therefrom, which in turn will withdraw heat by convection from the inner shielded band` I 9. However, the normal air sweep over-the external exposed inertia member I8 will effect sui'cient coolingaction thereof, to withdraw heat from the outer'resilient band I1. Thus,V it is found-'that indamper structures-which have soon been destroyed through overheating of therubber forming the energy converting medium, such Ainducedfaircooling action within the shielded portion of the damper-will prevent destruction thereof fromoverheating.

In the modied form of damper, as show-n in Fig. 3, the-principle ofthe air cooling action and the result obtained, are as above described when applied to aVv combination damper and pulley wherein the pulley may have the effect of shield'- ing the damper against normal external air cooling. Herein there is shown a drive or crank shaft I I mounted in a bearing I I I on the end of which there is keyed a driving disk |I2 having a hub portion II3. Said driving disk is formed with a cylindrical flange II4 having as a continuation thereof a shouldered portion ||5 terminating in a cylindrical extension I I6 which may serve as an engine fan pulley.

The driving disk I I2 is provided with an annular series of spaced air discharge ports II'I adjacent one end of its cylindrical flange ||4, and a similar annular series of spaced air discharge ports |I8 adjacent the opposite end of the cylindrical flange, as within the shoulder ||5 between said ilange and the pulley extension IIB.

Mounted about the cylindrical flange I I4 there is an outer band IIS of the energy converting medium such as rubber about which there is mounted an external inertia element |20. Mounted about the inner surface of said cylindrical flange there is an inner band I2I with an inner inertia member |22 carried thereby, al1 as above described in respect to Figs. l and 2.

The inner inertia member |22 is formed with a series of peripheral vanes |23 extending toward and adjacent to the driving disk I I2 for circulating cooling air over the surface of said member and discharging it through the discharge ports II'I, The inertia member |20 is provided with a similar series of vanes |24 extending toward and adjacent the pulley extension II'I. Said vanes are adapted to draw air through the ports II8, effecting circulation over the adjacent surface of the member |22, portions of the cylindrical flange II4, and particularly over the elements |20, for inducing extraction of heat from the bands ||9 and I2I. Thus, the shielding effect of the pulley mounted adjacent the inertia members will be overcome through the induced air circulation over and about said members with the resultant cooling of the interposed band of rubber energy converting medium.

In the modified form shown in Fig. 4 there is provided a damper having a single energy converting medium 2 I 9.v It is interposed between the inertia element 220 and the pulley 2 I6 carried 'by the driving plate 2I2 on the hub 2|3. In this modification the inertia element 220 is formed with laterally extending flns 22| and 222 extending from opposite sides thereof, respectively.

Said flns induce a current of cooling air over the surface of the inertia member for heat convection in the cooling of the medium 2|9. Plate 2|2 and pulley 2|6 are provided with air discharge apertures 223 as above described.

In the modied form of Fig. 5 the hub 3|3 is provided'with a radial driving plate 3|2 secured thereto. The inertia member is in the form of a pair of disks 320 and 3200i riveted together to clamp about the plate 3|2, a disk 3|9, U-shaped in cross section, comprising the energy converting medium. rFhe pulley 3|6 is provided on the periphery of the flange 3|6a extending from the hub 3| 3 and provided with a plurality of discharge apertures 323. Each of the clamping disks 320 of the inertia element is formed about its outer surface with a series of radially disposed fins 32| and 322 extending in close proximity to the flange 3I6a and a housing structure 324.

The invention claimed is:

1. In a vibration damper including a radially extending driving plate having an annular series of spaced air ports and a cylindrical flange, an energy converting medium carried by said flange substantially coextensive therewith, an annular inertia member mounted upon said medium, said medium acting to resiliently resist angular displacement of said member relative to said flange, and a series of air displacing vanes formed on said member extending outwardly to effect a circulation 0f cooling air thereover for dissipating heat from the medium during operation of the damper.

2. In a vibration damper including a radially extending driving plate having a cylindrical flange and an annular series of spaced air ports adjacent said flanges, an annular band of rubber or rubber-like material mounted upon said flange in direct contact with the inner surface thereof, an annular inertia member mounted upon said band in direct contact with its inner surface, said band acting to resist angular displacement of said member relative to said flange, and a series of air displacing vanes formed on said member extending toward and adjacent said driving plate and air ports to effect a circulation of cooling air over said member for discharge through said ports to thereby dissipate heat from said band during operation of the damper.

3. In a vibration damper including a radially extending driving plate having a cylindrical flange and an annular series of spaced air ports adjacent said flange, a pulley section formed as an extension of said flange having an annular series of air ports therebetween, energy converting material carried by the inner and outer surfaces respectively of said cylindrical flange, an inner inertia member carried by the inner material, an outer inertia member carried by the outer material, said material acting to resist angular displacement of said member relative to said flange, a series of air displacing vanes formed on said inner member extending forward and adjacent said first-mentioned ports, and a series of air displacing vanes formed on said outer member extending toward and adjacent said second-mentioned ports and pulley section, said vanes acting to circulate cooling air through their respective ports for dissipating heat from said material.

4.. In a vibration damper including a radially extending driving plate, a pulley section formed as an extension of said plate having an annular series of air ports therein, an energy converting medium carried by said plate, an inertia member carried by said medium, said medium acting to resist angular displacement of said member relative to said plate, a series of airdisplacing vanes formed on one side of said member extending adjacent said air ports, and a series of air displacing vanes formed on the opposite side of said member, said vanes acting to circulate cooling air thereover for dissipating heat from said medium.

JAMES A. HARDY.

REFERENCES CITED The following references are of record in the ille of this patent:

UNITED STATES PATENTS 

